We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

« previous next »
Pages: [1]

Author Topic: 48 volts at 10 amps Vs 12 volts at 20 amps?  (Read 1394 times)

Matt285

  • Guest
48 volts at 10 amps Vs 12 volts at 20 amps?
« on: October 28, 2019, 2352 UTC »
I've noticed adverts for 100 watt transmitters that show the PSU unit requirement for 48 volts at 10 amps as apposed to 12/13 volts at 20/22 amps. Just wondering why this is? Maybe its a European thing?
Logged

Offline Stretchyman

  • Hero Member
  • *****
  • Posts: 656
    • View Profile
Re: 48 volts at 10 amps Vs 12 volts at 20 amps?
« Reply #1 on: October 29, 2019, 0716 UTC »
You's have to give more particulars!

It's got nowt to do with EU (or US).

More volts is always better as losses are less.

I2R!

There are lots of 50V LDMOS devices now from NXP and with GaN and SiC going upto 900V much higher voltages can be used and efficiencies increased.

Folk use 12V because theyre lazy and lots of folk have some CB PSU they think will be fine!
That and it's in your car/truck etc...

48V is a 'telecomm' standard as all base stations use -48V.

48V SMPSU's are dirt cheap and the 10A version ideal for 100W (400W pep Class E Tx).

Str.
Logged
'It's better to give than receive' so why Rx when you can Tx!

                                              ;)
Pages: [1]
« previous next »